Motorized valve actuator can be equipped with a proof-of-closure switch which ensures that the valve is in the closed position or prevents the burner from igniting if it is not. Motorized valve actuator responds to open and close commands and stops when neither command is present. It features quick-opening motorized valve head that mounts directly onto 1-1/4″ brass and valved manifolds. Motorized valve actuator includes end switch for activation of relay (pump), heat plant or other auxiliary devices.